Abstract
Spinel MoCo2O4 was synthesized through epitaxial stabilization. X-ray photoemission spectroscopy revealed that the Mo and Co ions mainly exist as Mo4+ and high-spin (HS) Co2+ in the MoCo2O4 film, respectively. These valence states were consistent with the prediction based on the relation between lattice constants and ionic radii of cations in various spinel cobaltites. The magnetization of the film was composed of paramagnetic and ferrimagnetic components. Density function theory based calculations suggested that the paramagnetic component mainly corresponds to HS Mo4+ 4d2 ions at the octahedral site, while the ferrimagnetic component is derived from the antiferromagnetic interaction between HS Co2+ 3d7 ions at the tetrahedral and octahedral sites in inverse spinel Co[CoMo]O4.
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